ci: Change the GitHub Actions trigger, drop Celery 3 support (#261) #346

Job	Run time
matrix-builder	11s
Skipping on Python 3.11 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	17s
Test on Python 3.7 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 22s
Test on Python 3.7 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 16s
Test on Python 3.8 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 0s
Test on Python 3.8 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 2s
Test on Python 3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 10s
Test on Python 3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 11s
Test on Python 3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 0s
Test on Python 3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 3s
Test on Python 3.11 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 0s
Test on Python pypy-3.8-v7.3.11 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 36s
Test on Python pypy-3.8-v7.3.11 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 33s
Test on Python pypy-3.9-v7.3.11 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 48s
Test on Python pypy-3.9-v7.3.11 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 40s
	17m 9s

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